From: Serhiy Storchaka <storchaka@gmail.com>
Date: Wed, 29 Jan 2014 09:49:13 +0000 (+0200)
Subject: Backported a test for lone surrogates support in io.StringIO.
X-Git-Tag: v2.7.8~71
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=47cb38cdcc3e16d77ecc9808ad669181ce54b246;p=python

Backported a test for lone surrogates support in io.StringIO.
---

diff --git a/Lib/test/test_memoryio.py b/Lib/test/test_memoryio.py
index c3d559d6c4..f6aef4e2be 100644
--- a/Lib/test/test_memoryio.py
+++ b/Lib/test/test_memoryio.py
@@ -588,6 +588,16 @@ class PyStringIOTest(MemoryTestMixin, MemorySeekTestMixin,
     UnsupportedOperation = pyio.UnsupportedOperation
     EOF = ""
 
+    def test_lone_surrogates(self):
+        # Issue #20424
+        surrogate = unichr(0xd800)
+        memio = self.ioclass(surrogate)
+        self.assertEqual(memio.read(), surrogate)
+
+        memio = self.ioclass()
+        memio.write(surrogate)
+        self.assertEqual(memio.getvalue(), surrogate)
+
 
 class PyStringIOPickleTest(TextIOTestMixin, unittest.TestCase):
     """Test if pickle restores properly the internal state of StringIO.